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n in (-oo:+oo)
3*(7*n+5) = 225 // - 225
3*(7*n+5)-225 = 0
3*(7*n+5)-225 = 0
21*n-210 = 0
21*n-210 = 0
21*n-210 = 0 // + 210
21*n = 210 // : 21
n = 210/21
n = 10
n = 10
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